Plastic Solid Pet Rodent Mini Jogging Ball Hamster Gerbil Exercise Running Ball Fitness Portable Rolling Grounder Play Toys Accessory Feature: 1. The whole body can be washed. 2. The operation is simple the color cover can be removed by rotating. 3. Porous design to ensure air circulation. 4. Translucent ball body you can observe the pet s situation inside. Specification: Material: Plastic Color: Blue/Green/Red/White/Yellow Weight: 50g Size: Diameter: 10cm/3.94in Function: hamster rolling ball running toy. Note: 1. Due to the different monitor and light effect the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3mm measuring deviation due to manual measurement. Included: 1 X Rolling Ball